Posted: Mon Jan 14, 2013 4:40 pm Post subject: After I logout, I can NOT log in again .

After I logout , I can not input password in gdm , so can not log in again .
At that time , I can not see password form.
Even when I choose input login name, it says it is not valid utf8 code.
What is the matter?
I use gnome shell 3.6 with kernel 3.6.11.